Process of forming oxid of lead



(No Model.) T J. W. OOGHLAN.

PROCESS OF FORMING OXID 0P LEAD.

No. 552,102. Patented D90. 31, 1895.

VIA/65g II II INVENTOH L0. (9 BY WITNESSES:

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ATTORNEY.

* UNITED STATES PATENT OFFICE.

JOHN. W. (JOGII LAN, OF Cl [ICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE ALBRIGHT \YlU'lE LEAD COMPANY, OF NEVARK, NElV JERSEY.

PROCESSOF FORMING OXID OF LEAD.

SPECIFICATION forming part of Letters Patent No. 552,102, dated December 31, 1895.

' Application filed April 12, 1895. Serial No. 545,100. N pecimens.)

To'all whom it may concern.-

Be it known that 1, JOHN W. CQGHLAN, a

- Oxid of Lead, of which the following is a specification.

My invention relates to 'an improved process for transforming metallic lead intoan oxid of lead, the object of the invention being to provide a process whereby the use of acids may be entirely omitted and the time required to complete the process of making vessel a quantity of lead in a fine, comminuted or granulated state, in the presence of air and water, whereby the same will be pulverized or powdered and a portion thereof partially oxidized, and, secondly, withdraw- 'ing said powdered and partially-oxidized lead into a second vessel and there completing the oxidation by agitation in the presence of water and an oxidizing-gas.

v The process further consists incertain novel features hereinafter fully described, and pointed out in the. claims.

The accompanying drawing shows one 'form of apparatus which may be used for carrying out the process, but I would have it une ders'tood that I do not limit my invention to this or any other particular form or construction of device, as the latter may be varied or changed in structure in many ways to accomplish the same results.

In practice the pig or metallic lead is first treated in any desired manner to reduce it to a fine, comminute'd or granulated state, in

which condition it is emptied or fed into the first tank A, constructed of any suitable size or shape, and provided with an outlet a to allow of a portion of its contents being withdrawn into a second tank or vessel B, which may be constructed in substantially the same way as the tank A.

lVit-hin the tank or vessel A is located a revolving device consisting of several radial arms II, from which depend arms or plows h, said radialarms and plows being hollow.

This revolving device is connected with a hollow shaft 0., having openings h leading into the arms ll.

After a suffieient quantity of water and commiuuted lead hasbeen fed-into the vessel or tank A, the revolving shaft with its attached arms and plows is rapidly revolved,

' a current of air at the same time being forced through the hollow shaft (1, and into and throughout the mixture through the arms II- and hollowplows h, the efieot being that the lead and water is kept in a state of violent agitation, the purpose and eifect of which is to cause the particles of lead to rub and grind against each other until they are reduced to a finely pulverized or powdered condition, the introduction of the air into and.

throughout the mass causing a partial oxidation of'the pulverized lead. At a proper time the finer or powdered and partially-oxidized lead is drawn from thefirst into the second tank or vessel B, in which is located a revolving device 0, constructed, if desired, in the same way as that located in the tank A. In withdrawing the mixture from the first into the second vessel care should be taken that no metallic lead follow-that is, no metallic lead other than that whichis very finely pulverized and capable of being oxidizedin the second vessel. If the apparatus be of such form or structure that there is likely to be some of the larger or coarser particles drawn from the first vessel, I advise that instead of withdrawing-the mixture from the first tank directly into the second that suchmixture be be fed from the first vessel into a filter or separator (not shown) constructed in any suitable or desired manner, ,in order that such coarser particles may be prevented from entering the said secondvessel. From such filter or separator the coarser particles may be. re-

turned to the first tank forfurther grinding or pulverizing, while the finer or pulverized and partially-oxidized lead may be fed from said filter into the second vessel B. In the latter the partially-oxidized lead andwater is again violently agitated by the revolution of the hollow shaft and plows contained therein, this agitation continuing for a suitable length of timethat is, until the oxidation of the lead is completeda current of air or an oxid izing-gasas, for instance, oxygen itself-being introduced into and throughout the turbulent mass through the hollow shaft, arms, and plows, asin the first tank, this whirling or agitation and simultaneous introduction of the oxidizinggas causing the complete oxidation of every particle of metal.

By carrying out this process I have found in practice that a complete oxidation of the metal takes place in a few hours, the product being superior to that which has heretofore.

successful, in that it has been impossible to free the product from metallic lead. The defects in such prior processes I have learned by experiment lay in the manner of introducing the air intothe mass and also in the fact that in these attempts it was endeavored to grind orpulverize and oxidize in a single vessel. 1 therefore disclaim these prior processes, the gist of my present invention lying in the agitation of the comminuted or granulated lead in the presence of water, air being si-, multaneously introduced into and throughout the mass, for the purpose of pulverizing or powdering and partially oxidizing the lead;

secondly, again agitating thispartially oxidized lead and water and simultaneously introducing into and throughout the mass an oxidizing-gas while in a'second vessel; and

Hence what I claim as new, and vdesire to secure by Letters Patent, is a 1. The process of making an oxide of lead consisting in firstagitating. in a suitable vessel metallic lead in a comminuted form in the presence of water, and simultaneously intro.- ducing air into and throughout the rnass, for the purpose of pulverizing and partially oxidizing the same, secondly, separating the pulverized and partially oxidized lead from the coarser particles of metallic lead and again subjecting it in a second vessel to further agitation in the presence of water simultaneously with the introduction of an oxidizing gas into and throughout the mass for completing the oxidation, substantially as described.

2. The process of making an oxide of lead consisting in first agitating in asuitable vessel metallic lead in a comminuted form in the presence of air and water for the purpose of pulverizing and partially oxidizing the same; secondly, filtering the pulverized and partially oxidized lead from the metallic lead and thirdly," subjecting said pulverized and partially oxidized lead to agitation in the pres ence of Water and anoxidizing gas.

Signed at New York, in the county of New York and State'of New York, this 8th day of April. Ar D.. 1895.

JOHN \V. COGlILAN.

\Vitnesses:

GEORGE COOK, JOHN F. FLAGG, Jr. 

